Year	Percent
1950	15.51304
1955	15.50987
1960	15.3065
1965	15.17183
1970	15.17236
1975	15.56755
1980	15.30373
1985	14.29527
1990	14.46206
1995	14.86748
2000	15.90809
2005	17.04213
2010	17.49171
2015	18.01652
2020	19.26302
2025	20.90768
2030	22.58234
2035	23.02943
2040	22.36909
2045	21.74487
2050	21.41004
2055	23.04606
2060	24.50358
2065	25.23808
2070	25.51078
2075	24.90954
2080	24.95612
2085	25.34669
2090	25.69692
2095	25.68344
2100	25.34611