Year	Percent
1950	19.39989
1955	20.66262
1960	18.84732
1965	17.38934
1970	18.53528
1975	17.77879
1980	20.29081
1985	18.706
1990	18.01545
1995	20.09868
2000	21.12117
2005	23.68695
2010	24.27753
2015	24.03908
2020	23.60783
2025	23.14835
2030	25.18457
2035	25.77811
2040	24.32524
2045	22.47557
2050	21.3809
2055	22.73243
2060	24.9772
2065	26.53773
2070	25.9983
2075	24.25646
2080	23.53278
2085	23.73575
2090	24.33455
2095	24.64873
2100	24.39317