Year	Percent
1950	17.42124
1955	19.53866
1960	18.96509
1965	18.24605
1970	18.03779
1975	18.11849
1980	18.20516
1985	17.71352
1990	16.60676
1995	16.42703
2000	15.64587
2005	14.59986
2010	12.79796
2015	11.80829
2020	11.09429
2025	10.35011
2030	9.58745
2035	8.85282
2040	8.20405
2045	7.63713
2050	7.15008
2055	6.72491
2060	6.35643
2065	6.01768
2070	5.72979
2075	5.48335
2080	5.28728
2085	5.12169
2090	4.98724
2095	4.86967
2100	4.76616