Year	Percent
1950	17.55854
1955	20.93033
1960	21.4202
1965	22.46597
1970	21.99246
1975	21.19852
1980	17.99948
1985	17.58447
1990	13.56347
1995	12.41169
2000	12.96856
2005	11.28383
2010	10.56997
2015	9.06086
2020	8.65276
2025	7.51332
2030	6.88257
2035	6.62687
2040	6.51213
2045	6.44751
2050	6.31006
2055	6.08459
2060	5.87781
2065	5.77882
2070	5.76182
2075	5.7565
2080	5.7051
2085	5.60452
2090	5.49144
2095	5.40892
2100	5.36687