Year	Percent
1950	14.82031
1955	16.09084
1960	16.32675
1965	16.49314
1970	15.92187
1975	15.25351
1980	16.06849
1985	17.32095
1990	16.31856
1995	15.16522
2000	14.25454
2005	13.23524
2010	12.47708
2015	11.55388
2020	10.83924
2025	10.10396
2030	9.42138
2035	8.81327
2040	8.27031
2045	7.80465
2050	7.36924
2055	6.99747
2060	6.66755
2065	6.40367
2070	6.18779
2075	6.00733
2080	5.84802
2085	5.71171
2090	5.59964
2095	5.50569
2100	5.42554