Year	Percent
1950	17.17566
1955	17.4516
1960	17.47374
1965	17.55327
1970	17.68543
1975	17.5976
1980	17.34042
1985	17.42146
1990	18.49017
1995	19.23079
2000	20.02759
2005	19.26835
2010	18.93595
2015	18.36688
2020	18.09656
2025	17.50503
2030	16.79668
2035	16.02651
2040	15.25393
2045	14.53942
2050	13.86172
2055	13.16616
2060	12.48142
2065	11.82356
2070	11.23175
2075	10.67971
2080	10.16497
2085	9.67317
2090	9.20294
2095	8.74521
2100	8.33633