Year	Percent
1950	11.03527
1955	10.40208
1960	10.44013
1965	11.96265
1970	11.90041
1975	11.7677
1980	11.51069
1985	11.36983
1990	11.25344
1995	11.43567
2000	11.12741
2005	10.64458
2010	10.23814
2015	9.85697
2020	9.29505
2025	8.39298
2030	8.0564
2035	7.71519
2040	7.38344
2045	6.99374
2050	6.59906
2055	6.30088
2060	6.11356
2065	5.96186
2070	5.81353
2075	5.67478
2080	5.55235
2085	5.45788
2090	5.3898
2095	5.33692
2100	5.27412