Year	Percent
1950	13.32979
1955	15.37383
1960	15.27346
1965	15.24443
1970	15.66001
1975	14.17139
1980	15.75483
1985	18.20275
1990	17.19968
1995	16.73769
2000	17.06164
2005	17.19955
2010	17.04581
2015	16.51385
2020	15.82563
2025	15.18234
2030	14.31749
2035	13.36296
2040	12.45945
2045	11.6766
2050	10.92605
2055	10.23091
2060	9.57853
2065	8.96255
2070	8.41171
2075	7.9041
2080	7.46974
2085	7.08278
2090	6.74074
2095	6.43681
2100	6.16594