Year	Percent
1950	7.58689
1955	8.38954
1960	9.82897
1965	9.68208
1970	10.25967
1975	10.03276
1980	9.41391
1985	8.88184
1990	7.38302
1995	6.86432
2000	7.24796
2005	7.24164
2010	6.50169
2015	6.18154
2020	6.36303
2025	6.08948
2030	5.93527
2035	5.80508
2040	5.64036
2045	5.46384
2050	5.35529
2055	5.30514
2060	5.25555
2065	5.19704
2070	5.11462
2075	5.02519
2080	4.95185
2085	4.90325
2090	4.86303
2095	4.82425
2100	4.77773