A high rating does not necessarily imply that a fund had the best total performance or that the fund achieved positive results for that period. Morningstar rating is for the named share class only; other classes may have difference performance characteristics. Please see the Performance section for results as of the most recent month- and quarter-end.

The Morningstar Rating™ for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds, and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product’s monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods.

Overall Risk vs Category
An assessment of the variations in a fund's monthly returns in comparison to similar funds, with an emphasis on downward variation. The greater the variation, the larger the risk score. If two funds have the exact same return, the one with greater variations in its return is given the larger risk score. In each Morningstar Category, the 10% of funds with the lowest measured risk are described as Low Risk, the next 22.5% Below Average, the middle 35% Average, the next 22.5% Above Average, and the top 10% High. Morningstar Risk is measured for up to three time periods (three-, five-, and 10-years). These separate measures are then weighted and averaged to produce an overall measure for the fund. The score shown is the overall measure. Funds with less than three years of performance history are not rated.

Overall Return vs Category
An assessment of a fund's excess return over a risk-free rate (the return of the 90-day Treasury bill) in comparison to similar funds, with an emphasis on downward variation. Therefore, if two funds have precisely the same return, the one with greater variations in its return is given the lower return score. In each Morningstar Category, the top 10% of funds earn a High Morningstar Return, the next 22.5% Above Average, the middle 35% Average, the next 22.5% Below Average, and the bottom 10% Low. Morningstar Return is measured for up to three time periods (three-, five-, and 10-years). These separate measures are then weighted and averaged to produce an overall measure for a fund. The score shown is the overall measure. Funds with less than three years of performance history are not rated.