Year	Percent
1950	30.73037
1955	29.60929
1960	27.11163
1965	24.17526
1970	22.52251
1975	23.33343
1980	25.52421
1985	28.57643
1990	31.00326
1995	32.01635
2000	32.77515
2005	33.55289
2010	34.18395
2015	34.2226
2020	31.95231
2025	28.94381
2030	26.24726
2035	24.2756
2040	24.13983
2045	24.36862
2050	23.87809
2055	22.81501
2060	21.88479
2065	21.25667
2070	21.19222
2075	21.46632
2080	21.59274
2085	21.37632
2090	20.98147
2095	20.66089
2100	20.54053