Year	Percent
1950	11.30715
1955	11.28281
1960	9.55078
1965	10.06708
1970	9.01327
1975	9.93955
1980	11.42084
1985	11.59725
1990	12.04265
1995	12.70419
2000	12.34815
2005	12.32381
2010	12.65923
2015	12.80002
2020	12.76747
2025	12.68304
2030	12.32353
2035	11.90672
2040	11.48304
2045	11.06092
2050	10.60892
2055	10.10532
2060	9.59138
2065	9.11204
2070	8.69257
2075	8.32027
2080	7.9929
2085	7.6812
2090	7.3881
2095	7.12592
2100	6.90835