Year	Percent
1950	17.96786
1955	18.24286
1960	18.42548
1965	18.75192
1970	19.06352
1975	19.18086
1980	18.96898
1985	18.27401
1990	17.53898
1995	17.33729
2000	17.11936
2005	16.66677
2010	16.0815
2015	15.15991
2020	14.43623
2025	13.83725
2030	13.32217
2035	12.75994
2040	12.13205
2045	11.50485
2050	10.94551
2055	10.46703
2060	10.05131
2065	9.66932
2070	9.27484
2075	8.8782
2080	8.50566
2085	8.17763
2090	7.88692
2095	7.59141
2100	7.31891