Year	Percent
1950	12.05046
1955	11.42897
1960	10.51389
1965	10.82035
1970	11.1327
1975	11.2105
1980	11.28185
1985	11.72448
1990	12.37758
1995	12.24223
2000	12.06309
2005	12.38197
2010	12.74482
2015	12.39606
2020	12.0551
2025	12.05823
2030	11.99519
2035	11.76769
2040	11.46264
2045	11.18353
2050	10.91429
2055	10.64743
2060	10.36804
2065	10.0785
2070	9.81815
2075	9.55825
2080	9.30576
2085	9.04507
2090	8.80184
2095	8.5547
2100	8.32748