Year	Percent
1950	29.42809
1955	28.32004
1960	27.03441
1965	26.32168
1970	25.75822
1975	25.87037
1980	25.1704
1985	25.4264
1990	28.48564
1995	29.90629
2000	31.07676
2005	30.60285
2010	30.86865
2015	32.05456
2020	32.62485
2025	32.45397
2030	31.79054
2035	31.48876
2040	31.38836
2045	31.43589
2050	31.25181
2055	30.40392
2060	29.55602
2065	28.84745
2070	28.27424
2075	27.71758
2080	27.085
2085	26.37037
2090	25.64214
2095	24.98523
2100	24.43246