Year	Percent
1950	21.68923
1955	21.7647
1960	21.47694
1965	21.18099
1970	20.86572
1975	19.72682
1980	19.89508
1985	20.09887
1990	21.70645
1995	23.26067
2000	25.45091
2005	26.91608
2010	26.57889
2015	26.10067
2020	24.55927
2025	23.09638
2030	22.94422
2035	23.67452
2040	24.63143
2045	24.89459
2050	24.88659
2055	24.20184
2060	23.95444
2065	24.09691
2070	23.79413
2075	23.51791
2080	23.21723
2085	22.96752
2090	22.79254
2095	22.68409
2100	22.56668