Year	Percent
1950	13.8691
1955	13.94168
1960	13.51607
1965	13.24505
1970	13.42877
1975	13.75238
1980	14.49961
1985	15.46055
1990	16.94786
1995	18.91859
2000	22.68484
2005	25.79133
2010	28.93834
2015	30.42887
2020	30.58454
2025	29.48885
2030	27.72249
2035	26.85545
2040	26.71218
2045	26.89743
2050	27.29791
2055	26.85148
2060	25.65974
2065	24.67054
2070	23.91593
2075	23.43437
2080	23.42313
2085	23.5325
2090	23.4629
2095	23.24567
2100	23.04306