Year	Percent
1950	28.59091
1955	28.99958
1960	31.39929
1965	29.9747
1970	27.90804
1975	27.23632
1980	26.98645
1985	27.18998
1990	27.09929
1995	26.32079
2000	25.69371
2005	25.6668
2010	26.05012
2015	24.44887
2020	21.97086
2025	19.96572
2030	18.91005
2035	18.84367
2040	20.63035
2045	21.48628
2050	20.70114
2055	19.90331
2060	19.57816
2065	19.86907
2070	20.65439
2075	21.40877
2080	21.55613
2085	21.10867
2090	20.57286
2095	20.35168
2100	20.51785