Year	Percent
1950	18.27065
1955	17.11567
1960	18.27342
1965	17.9695
1970	15.69546
1975	13.21074
1980	13.37227
1985	13.50742
1990	12.92412
1995	11.5512
2000	10.03764
2005	8.49248
2010	7.93386
2015	7.28654
2020	6.75571
2025	6.22201
2030	5.78527
2035	5.43518
2040	5.16122
2045	4.9731
2050	4.81783
2055	4.68382
2060	4.56142
2065	4.47553
2070	4.41819
2075	4.39066
2080	4.38528
2085	4.38281
2090	4.38151
2095	4.37975
2100	4.38115