Year	Percent
1950	7.99444
1955	11.29444
1960	12.24027
1965	10.86519
1970	8.74565
1975	9.00848
1980	8.81331
1985	9.29441
1990	9.14714
1995	7.08526
2000	5.39004
2005	4.56758
2010	5.05291
2015	5.08968
2020	4.59607
2025	4.11142
2030	3.79174
2035	3.60731
2040	3.6361
2045	3.7532
2050	3.79079
2055	3.71551
2060	3.62662
2065	3.62257
2070	3.73475
2075	3.92045
2080	4.09128
2085	4.17384
2090	4.18218
2095	4.18592
2100	4.23454