Year	Percent
1950	19.12971
1955	18.43611
1960	17.65465
1965	15.96278
1970	14.05571
1975	12.79667
1980	11.97817
1985	11.69446
1990	11.0605
1995	11.58517
2000	11.36666
2005	11.56754
2010	12.87818
2015	13.8051
2020	15.14775
2025	16.14996
2030	16.66409
2035	17.07274
2040	17.53255
2045	17.94926
2050	18.53848
2055	19.32793
2060	20.02197
2065	20.7041
2070	21.23225
2075	21.61545
2080	22.03019
2085	22.47301
2090	22.88886
2095	23.24487
2100	23.52401