Year	Percent
1950	26.10637
1955	28.98874
1960	33.0704
1965	30.0429
1970	26.77615
1975	28.03584
1980	29.80055
1985	33.66358
1990	34.04235
1995	30.67078
2000	27.74341
2005	28.11706
2010	30.53322
2015	32.39174
2020	31.72843
2025	29.62087
2030	27.55594
2035	27.1115
2040	27.45897
2045	27.27896
2050	25.43954
2055	23.06958
2060	21.62036
2065	21.22622
2070	21.39503
2075	21.49784
2080	21.14037
2085	20.4992
2090	20.08585
2095	20.16011
2100	20.594