Year	Percent
1950	18.78691
1955	18.32639
1960	18.76506
1965	19.24258
1970	17.31672
1975	15.21525
1980	14.77787
1985	14.19118
1990	13.7344
1995	12.44646
2000	11.32149
2005	10.55354
2010	9.91973
2015	9.29553
2020	8.63887
2025	8.01337
2030	7.47139
2035	6.99411
2040	6.58779
2045	6.24134
2050	5.9276
2055	5.66275
2060	5.43653
2065	5.25141
2070	5.0975
2075	4.9679
2080	4.85931
2085	4.77092
2090	4.6945
2095	4.63658
2100	4.59261