Year	Percent
1950	16.81237
1955	19.25585
1960	18.82739
1965	18.38099
1970	17.48049
1975	16.94683
1980	13.90398
1985	20.55463
1990	20.11136
1995	17.23105
2000	13.46558
2005	12.0048
2010	12.30978
2015	11.89253
2020	11.15304
2025	10.09621
2030	9.23541
2035	8.72811
2040	8.35745
2045	7.9167
2050	7.4072
2055	6.94308
2060	6.59274
2065	6.33905
2070	6.13709
2075	5.92974
2080	5.72505
2085	5.54334
2090	5.39663
2095	5.27944
2100	5.18644