Year	Percent
1950	17.74795
1955	15.67173
1960	17.00179
1965	17.86482
1970	18.37396
1975	18.29752
1980	18.18433
1985	17.89182
1990	18.3841
1995	18.38591
2000	18.07678
2005	17.23808
2010	16.68939
2015	16.05156
2020	15.45368
2025	14.78723
2030	14.03265
2035	13.26115
2040	12.55162
2045	11.9405
2050	11.37124
2055	10.8192
2060	10.27565
2065	9.76665
2070	9.3044
2075	8.88307
2080	8.49083
2085	8.11466
2090	7.77123
2095	7.45012
2100	7.16673