Year	Percent
1950	29.30933
1955	26.61599
1960	26.60901
1965	23.94894
1970	24.63103
1975	22.3533
1980	27.53315
1985	30.23551
1990	32.71835
1995	31.51429
2000	31.32242
2005	25.49793
2010	23.48391
2015	21.29013
2020	20.25844
2025	20.70999
2030	20.75693
2035	20.93031
2040	20.47148
2045	19.38984
2050	18.30714
2055	18.98663
2060	19.37449
2065	19.76959
2070	19.79145
2075	19.44488
2080	18.98269
2085	18.76813
2090	18.85003
2095	18.93212
2100	18.89554