Year	Percent
1950	12.01605
1955	12.29292
1960	12.57172
1965	11.44357
1970	11.89784
1975	12.41811
1980	12.74349
1985	12.74414
1990	12.55346
1995	12.36951
2000	12.19532
2005	11.79194
2010	11.51091
2015	11.04661
2020	11.14476
2025	11.27769
2030	10.7456
2035	10.20223
2040	9.78885
2045	9.50356
2050	9.26804
2055	9.0468
2060	8.76242
2065	8.42129
2070	8.10491
2075	7.84396
2080	7.61106
2085	7.37814
2090	7.13735
2095	6.8976
2100	6.66013