Year	Percent
1950	17.87053
1955	15.92949
1960	17.12237
1965	17.87554
1970	18.2968
1975	18.1617
1980	18.01175
1985	17.6947
1990	18.15474
1995	18.1311
2000	17.81988
2005	16.99486
2010	16.46517
2015	15.84255
2020	15.28678
2025	14.64147
2030	13.89737
2035	13.13371
2040	12.42977
2045	11.81252
2050	11.23969
2055	10.68205
2060	10.13454
2065	9.61895
2070	9.14973
2075	8.72352
2080	8.32513
2085	7.94196
2090	7.59185
2095	7.26442
2100	6.97661