Year	Percent
1950	11.87946
1955	11.30038
1960	10.67938
1965	12.71068
1970	12.74813
1975	12.92573
1980	12.66958
1985	12.74288
1990	13.0463
1995	13.06397
2000	12.45565
2005	10.91149
2010	8.30464
2015	7.25663
2020	8.74732
2025	9.90397
2030	8.84254
2035	7.73496
2040	6.80354
2045	6.32884
2050	6.2882
2055	6.41653
2060	6.40813
2065	6.09867
2070	5.67152
2075	5.39055
2080	5.31149
2085	5.34665
2090	5.35923
2095	5.2723
2100	5.11083