Year	Percent
1950	20.73154
1955	20.62072
1960	20.39073
1965	20.59239
1970	20.77862
1975	20.51431
1980	20.5209
1985	21.00117
1990	22.73059
1995	24.91361
2000	27.91673
2005	30.25028
2010	29.87143
2015	28.61259
2020	26.801
2025	25.45949
2030	25.29398
2035	25.88276
2040	25.82537
2045	25.0279
2050	24.65901
2055	24.03106
2060	23.97893
2065	24.22335
2070	24.0467
2075	23.72703
2080	23.39307
2085	23.16975
2090	23.06515
2095	23.03804
2100	22.96506