Year	Percent
1950	12.92556
1955	12.1518
1960	11.53949
1965	12.50234
1970	12.59533
1975	14.00253
1980	14.06459
1985	15.04967
1990	14.97795
1995	14.96723
2000	14.78905
2005	15.1408
2010	15.26556
2015	15.07132
2020	14.80916
2025	14.23376
2030	13.60438
2035	12.97601
2040	12.35799
2045	11.72242
2050	11.05125
2055	10.39064
2060	9.78564
2065	9.25878
2070	8.79088
2075	8.37834
2080	7.99126
2085	7.63378
2090	7.31585
2095	7.05263
2100	6.80973