Year	Percent
1950	13.69084
1955	13.56985
1960	13.36527
1965	13.0785
1970	12.86788
1975	12.83358
1980	13.21977
1985	13.9659
1990	14.92673
1995	16.17037
2000	17.64951
2005	19.29351
2010	20.88989
2015	22.23497
2020	23.08845
2025	23.45981
2030	23.59881
2035	23.51864
2040	23.59948
2045	23.70511
2050	23.8539
2055	24.1463
2060	24.21528
2065	24.25537
2070	24.19034
2075	23.9547
2080	23.73581
2085	23.50434
2090	23.23291
2095	22.93663
2100	22.64272