Year	Percent
1950	28.97844
1955	28.60755
1960	28.52457
1965	27.24356
1970	24.99022
1975	23.86808
1980	23.44773
1985	24.65212
1990	27.58008
1995	31.26713
2000	35.16404
2005	38.31663
2010	38.85214
2015	36.06049
2020	33.14047
2025	30.8327
2030	29.4555
2035	29.26094
2040	28.94306
2045	28.10888
2050	26.62455
2055	24.8402
2060	23.72043
2065	23.25162
2070	23.18889
2075	23.13936
2080	22.82827
2085	22.28928
2090	21.7674
2095	21.4839
2100	21.46538