Year Percent 1950 17.21803 1955 18.34143 1960 19.48679 1965 21.00047 1970 22.64212 1975 23.89291 1980 25.24529 1985 26.52726 1990 28.35044 1995 28.55629 2000 27.8084 2005 26.69217 2010 25.24334 2015 25.97762 2020 26.65566 2025 26.66281 2030 25.61802 2035 23.19683 2040 21.89019 2045 21.04181 2050 20.73964 2055 20.7425 2060 20.62427 2065 20.59276 2070 20.53618 2075 20.51062 2080 20.55129 2085 20.64096 2090 20.69491 2095 20.65395 2100 20.52364