Year	Percent
1950	17.09789
1955	17.08779
1960	18.02208
1965	18.61893
1970	18.94641
1975	18.94225
1980	19.9276
1985	19.85989
1990	17.8338
1995	14.01889
2000	12.47262
2005	10.18589
2010	9.63429
2015	9.14934
2020	7.72358
2025	6.75729
2030	5.76483
2035	5.2144
2040	5.06176
2045	5.095
2050	5.02699
2055	4.78375
2060	4.46617
2065	4.22889
2070	4.15587
2075	4.20649
2080	4.27848
2085	4.28473
2090	4.22497
2095	4.16331
2100	4.15939