Year	Percent
1950	10.11348
1955	9.48263
1960	9.06729
1965	9.06445
1970	8.53126
1975	8.06099
1980	7.02785
1985	7.14837
1990	6.93116
1995	6.50988
2000	6.48218
2005	6.55779
2010	6.52531
2015	6.26642
2020	6.02368
2025	5.88083
2030	5.83823
2035	5.8622
2040	5.85627
2045	5.78372
2050	5.68509
2055	5.61642
2060	5.59733
2065	5.60274
2070	5.58692
2075	5.53748
2080	5.46364
2085	5.39084
2090	5.34368
2095	5.30888
2100	5.28875