Year	Percent
1950	18.91047
1955	19.70866
1960	19.01663
1965	18.43202
1970	17.61236
1975	15.96205
1980	16.09884
1985	16.29286
1990	15.61024
1995	14.46631
2000	13.3709
2005	11.61358
2010	10.92185
2015	10.19544
2020	9.77353
2025	9.20655
2030	8.56432
2035	7.96582
2040	7.49317
2045	7.10821
2050	6.79025
2055	6.49337
2060	6.20741
2065	5.95395
2070	5.75228
2075	5.58196
2080	5.42695
2085	5.29693
2090	5.19231
2095	5.10483
2100	5.02261