Year	Percent
1950	15.29593
1955	16.7805
1960	15.94266
1965	15.67866
1970	15.93308
1975	16.57546
1980	18.35753
1985	19.14978
1990	18.43838
1995	17.73354
2000	17.16916
2005	16.47934
2010	16.45075
2015	16.12481
2020	15.23571
2025	14.26054
2030	13.38665
2035	12.74188
2040	12.21165
2045	11.66464
2050	11.09229
2055	10.50013
2060	9.96739
2065	9.52354
2070	9.11815
2075	8.74246
2080	8.34782
2085	7.96285
2090	7.60471
2095	7.29624
2100	7.02616