Year	Percent
1950	18.13785
1955	19.06718
1960	18.92695
1965	18.9764
1970	19.16823
1975	19.12404
1980	19.23016
1985	19.36128
1990	19.49702
1995	19.81974
2000	19.77561
2005	19.73747
2010	19.23082
2015	18.43121
2020	17.64193
2025	16.83762
2030	16.02273
2035	15.15842
2040	14.26606
2045	13.41642
2050	12.6169
2055	11.88029
2060	11.18817
2065	10.53305
2070	9.92679
2075	9.36724
2080	8.84852
2085	8.37288
2090	7.93262
2095	7.52865
2100	7.15468