Year	Percent
1950	11.81973
1955	12.07329
1960	10.80966
1965	11.22175
1970	11.60727
1975	11.82764
1980	12.01949
1985	12.3335
1990	12.65645
1995	12.95939
2000	12.39645
2005	11.87723
2010	12.35578
2015	12.71082
2020	12.45102
2025	11.9352
2030	11.58415
2035	11.30604
2040	11.04523
2045	10.73032
2050	10.37744
2055	9.99525
2060	9.62926
2065	9.2899
2070	8.96006
2075	8.65671
2080	8.34285
2085	8.03171
2090	7.73459
2095	7.44574
2100	7.17388