Year	Percent
1950	13.94594
1955	14.29121
1960	12.81126
1965	13.41447
1970	13.74451
1975	14.17473
1980	14.33676
1985	14.54456
1990	14.2758
1995	15.55925
2000	14.00066
2005	11.67232
2010	9.98666
2015	9.26471
2020	8.39718
2025	7.96078
2030	7.31008
2035	6.63727
2040	6.07166
2045	5.68477
2050	5.44949
2055	5.29115
2060	5.13748
2065	4.97486
2070	4.83469
2075	4.75351
2080	4.73577
2085	4.74957
2090	4.75777
2095	4.74141
2100	4.71369