Year	Percent
1950	14.0473
1955	14.24339
1960	15.45177
1965	14.36047
1970	13.64927
1975	10.35757
1980	8.3302
1985	7.82176
1990	9.03161
1995	8.02706
2000	8.47492
2005	7.75634
2010	7.45486
2015	6.90163
2020	5.72351
2025	5.76123
2030	6.00298
2035	6.26658
2040	6.22218
2045	5.91708
2050	5.59072
2055	5.45042
2060	5.50904
2065	5.59501
2070	5.55413
2075	5.38296
2080	5.19214
2085	5.09411
2090	5.09462
2095	5.15015
2100	5.15975