Year	Percent
1950	15.60535
1955	15.92455
1960	16.13097
1965	16.86168
1970	17.46475
1975	17.91687
1980	18.35161
1985	18.86196
1990	18.66223
1995	17.87042
2000	17.09957
2005	17.11976
2010	16.99885
2015	16.38546
2020	15.48231
2025	14.65246
2030	13.92369
2035	13.29178
2040	12.66732
2045	12.06636
2050	11.46508
2055	10.88664
2060	10.34764
2065	9.86984
2070	9.43984
2075	9.01582
2080	8.60874
2085	8.22076
2090	7.8581
2095	7.52475
2100	7.21845