Year	Percent
1950	12.28953
1955	11.49448
1960	10.34539
1965	10.79858
1970	11.96408
1975	12.24543
1980	12.32926
1985	12.01792
1990	11.62981
1995	11.20749
2000	10.20603
2005	9.83932
2010	9.1607
2015	8.96546
2020	8.53337
2025	8.42223
2030	7.83288
2035	7.35901
2040	7.01158
2045	6.77487
2050	6.57864
2055	6.37515
2060	6.17039
2065	5.97731
2070	5.82183
2075	5.70398
2080	5.61707
2085	5.52668
2090	5.44045
2095	5.36286
2100	5.29683