Year	Percent
1950	28.21197
1955	29.48183
1960	30.08233
1965	30.14093
1970	30.25231
1975	29.52741
1980	28.91441
1985	27.48205
1990	26.74312
1995	27.05004
2000	28.5706
2005	34.56977
2010	37.40191
2015	38.9329
2020	37.41141
2025	33.9641
2030	31.25775
2035	29.18209
2040	27.96484
2045	27.0709
2050	25.92484
2055	24.82572
2060	23.64664
2065	22.74033
2070	22.22531
2075	22.00356
2080	21.88229
2085	21.71193
2090	21.47313
2095	21.25466
2100	21.13408