Year	Percent
1950	30.27854
1955	31.71004
1960	32.64413
1965	30.87935
1970	27.42265
1975	26.2908
1980	26.71901
1985	27.98878
1990	29.07487
1995	30.59905
2000	30.95127
2005	30.43647
2010	28.34671
2015	25.30916
2020	23.01088
2025	21.42337
2030	21.54335
2035	21.4027
2040	20.68808
2045	19.73313
2050	18.48719
2055	18.07343
2060	18.42117
2065	19.1176
2070	19.62453
2075	19.72227
2080	19.48832
2085	19.2225
2090	19.20852
2095	19.47451
2100	19.8039