Year	Percent
1950	17.07668
1955	16.2547
1960	17.83812
1965	18.81647
1970	19.00322
1975	19.11773
1980	16.42507
1985	16.98708
1990	15.28366
1995	13.98767
2000	12.58268
2005	11.19539
2010	10.55988
2015	10.80638
2020	9.79759
2025	8.99795
2030	8.25223
2035	7.63966
2040	7.184
2045	6.866
2050	6.59176
2055	6.32984
2060	6.06895
2065	5.85492
2070	5.69284
2075	5.57166
2080	5.48192
2085	5.39446
2090	5.30887
2095	5.22397
2100	5.15667