Year	Percent
1950	15.79762
1955	19.06149
1960	19.18463
1965	19.41553
1970	19.30555
1975	19.47117
1980	19.76169
1985	18.76632
1990	16.85319
1995	15.4397
2000	14.60492
2005	14.65083
2010	15.32241
2015	15.38733
2020	13.88383
2025	12.66091
2030	11.81199
2035	11.22631
2040	10.63049
2045	9.97051
2050	9.27708
2055	8.5954
2060	8.02223
2065	7.5434
2070	7.1512
2075	6.79533
2080	6.45413
2085	6.15812
2090	5.9012
2095	5.69955
2100	5.53568