Year	Percent
1950	20.93776
1955	19.30358
1960	19.95889
1965	18.02668
1970	18.73554
1975	20.86211
1980	23.44675
1985	26.99086
1990	30.64963
1995	32.7804
2000	33.17934
2005	32.65169
2010	32.14247
2015	31.73324
2020	31.30108
2025	30.28553
2030	29.5633
2035	28.48752
2040	27.46055
2045	26.64789
2050	25.46918
2055	24.42534
2060	23.49006
2065	22.76296
2070	22.23257
2075	21.77055
2080	21.29966
2085	20.83391
2090	20.42435
2095	20.10155
2100	19.8726