Year	Percent
1950	10.2302
1955	11.32428
1960	12.16301
1965	12.49215
1970	13.38798
1975	13.74128
1980	10.63611
1985	9.95548
1990	10.22345
1995	11.64929
2000	10.07343
2005	7.81649
2010	6.45021
2015	6.45438
2020	6.75726
2025	6.64354
2030	6.00563
2035	5.43106
2040	5.11916
2045	5.10535
2050	5.22548
2055	5.26057
2060	5.13969
2065	4.96514
2070	4.87446
2075	4.90692
2080	5.00899
2085	5.07643
2090	5.05638
2095	4.98245
2100	4.92794