Year	Percent
1950	12.11219
1955	11.73797
1960	11.41914
1965	12.31097
1970	12.94356
1975	13.02731
1980	12.9559
1985	12.91854
1990	12.90745
1995	12.92434
2000	12.65655
2005	12.3314
2010	12.04956
2015	11.72874
2020	11.62234
2025	11.60929
2030	11.27221
2035	10.90393
2040	10.55712
2045	10.26587
2050	10.01962
2055	9.77963
2060	9.53246
2065	9.27699
2070	9.03259
2075	8.80583
2080	8.59248
2085	8.38732
2090	8.20059
2095	8.02274
2100	7.8195