Year	Percent
1950	13.35113
1955	13.73694
1960	13.77982
1965	13.64949
1970	13.43667
1975	13.20982
1980	12.82321
1985	12.39928
1990	12.02469
1995	11.95544
2000	12.37411
2005	12.99915
2010	13.75221
2015	14.55756
2020	15.33563
2025	16.11805
2030	16.86174
2035	17.48138
2040	18.02112
2045	18.55338
2050	19.18351
2055	19.98275
2060	20.74833
2065	21.42185
2070	21.94866
2075	22.32641
2080	22.69959
2085	23.0832
2090	23.46828
2095	23.8181
2100	24.11685