Year	Percent
1950	9.49391
1955	14.65902
1960	13.28054
1965	10.55827
1970	9.27249
1975	7.24196
1980	7.46666
1985	7.95565
1990	7.56299
1995	7.04737
2000	6.3966
2005	5.88388
2010	4.65233
2015	4.50694
2020	4.77211
2025	4.84057
2030	4.8223
2035	4.64338
2040	4.37926
2045	4.23039
2050	4.28074
2055	4.43174
2060	4.53997
2065	4.54062
2070	4.46698
2075	4.39213
2080	4.39402
2085	4.48015
2090	4.58115
2095	4.62158
2100	4.59229