Year	Percent
1950	12.40868
1955	12.11886
1960	12.41316
1965	11.71559
1970	10.73533
1975	9.99841
1980	8.33208
1985	7.97639
1990	8.45044
1995	8.42655
2000	7.68492
2005	7.18283
2010	7.47305
2015	6.98227
2020	6.75728
2025	6.53589
2030	6.27443
2035	6.01031
2040	5.83557
2045	5.73702
2050	5.64743
2055	5.5564
2060	5.4476
2065	5.33384
2070	5.23302
2075	5.1552
2080	5.09272
2085	5.04399
2090	4.9941
2095	4.94114
2100	4.88667