Year	Percent
1950	8.68706
1955	7.35305
1960	8.06835
1965	9.45003
1970	9.99758
1975	10.47521
1980	10.00148
1985	8.83551
1990	8.47513
1995	7.97604
2000	7.95431
2005	7.33371
2010	7.64645
2015	6.74955
2020	6.31081
2025	6.75714
2030	6.30174
2035	6.09916
2040	5.91071
2045	5.68411
2050	5.50468
2055	5.42088
2060	5.37828
2065	5.30827
2070	5.20412
2075	5.1068
2080	5.0302
2085	4.98563
2090	4.96713
2095	4.94396
2100	4.90637