Year	Percent
1950	12.27455
1955	12.21549
1960	13.35936
1965	13.2411
1970	12.94436
1975	12.4923
1980	11.179
1985	10.13987
1990	9.90497
1995	9.96512
2000	9.1475
2005	8.16317
2010	7.38268
2015	7.0046
2020	6.4973
2025	6.18485
2030	5.89954
2035	5.62365
2040	5.36311
2045	5.15745
2050	5.02141
2055	4.91636
2060	4.84119
2065	4.77169
2070	4.71176
2075	4.65632
2080	4.63183
2085	4.61986
2090	4.61634
2095	4.61338
2100	4.5956