Year	Percent
1950	12.26946
1955	12.40498
1960	12.5442
1965	12.53365
1970	12.96671
1975	13.43825
1980	14.14866
1985	14.41745
1990	14.64721
1995	14.4505
2000	14.31832
2005	14.4992
2010	14.43733
2015	14.28258
2020	13.43525
2025	12.75695
2030	12.10836
2035	11.5099
2040	10.89279
2045	10.29136
2050	9.71017
2055	9.1782
2060	8.7085
2065	8.25961
2070	7.86462
2075	7.50314
2080	7.18664
2085	6.90728
2090	6.67092
2095	6.47043
2100	6.29092