Year	Percent
1950	28.96468
1955	26.70276
1960	27.12252
1965	26.18818
1970	27.76189
1975	29.43656
1980	30.31084
1985	29.54613
1990	27.76213
1995	27.97805
2000	30.18008
2005	30.6252
2010	30.65399
2015	28.23455
2020	24.00705
2025	21.79388
2030	20.96824
2035	20.79857
2040	21.93264
2045	22.46179
2050	21.71132
2055	20.96597
2060	20.62578
2065	20.89405
2070	21.5766
2075	22.21938
2080	22.32322
2085	21.91541
2090	21.43149
2095	21.19687
2100	21.25697