Year	Percent
1950	11.77074
1955	12.04871
1960	12.22257
1965	11.68215
1970	11.62873
1975	11.90763
1980	11.50342
1985	12.30107
1990	12.29992
1995	12.92175
2000	12.72337
2005	12.93426
2010	13.57862
2015	13.01245
2020	12.00701
2025	11.54847
2030	11.06955
2035	10.54908
2040	9.95005
2045	9.36601
2050	8.79968
2055	8.31259
2060	7.86099
2065	7.43975
2070	7.04987
2075	6.70514
2080	6.40023
2085	6.14657
2090	5.92724
2095	5.74552
2100	5.58045