Year	Percent
1950	12.24014
1955	11.78377
1960	13.44436
1965	14.37683
1970	14.55789
1975	14.47316
1980	14.45478
1985	14.70266
1990	15.29736
1995	15.24062
2000	14.52217
2005	13.91126
2010	13.50762
2015	13.31397
2020	13.12441
2025	12.5026
2030	11.85496
2035	11.28656
2040	10.83188
2045	10.44276
2050	10.05705
2055	9.65755
2060	9.23684
2065	8.85966
2070	8.51541
2075	8.22522
2080	7.92272
2085	7.62125
2090	7.33592
2095	7.07066
2100	6.84193