Year	Percent
1950	30.27021
1955	29.16949
1960	28.27715
1965	27.39347
1970	28.00178
1975	29.18
1980	30.42818
1985	33.16644
1990	34.23316
1995	34.38049
2000	32.76764
2005	32.20929
2010	31.71909
2015	31.81342
2020	31.57284
2025	29.14961
2030	27.2658
2035	25.39966
2040	24.42169
2045	24.59152
2050	24.22621
2055	23.56462
2060	22.8384
2065	22.26089
2070	21.96192
2075	21.89897
2080	21.91677
2085	21.82438
2090	21.59282
2095	21.32824
2100	21.13105