Year	Percent
1950	8.38042
1955	7.16212
1960	8.04333
1965	9.05908
1970	9.63411
1975	10.11724
1980	9.75855
1985	8.57868
1990	8.15359
1995	7.74738
2000	7.59672
2005	7.0803
2010	7.39746
2015	6.51101
2020	6.21307
2025	6.42338
2030	6.20097
2035	5.89141
2040	5.71208
2045	5.49704
2050	5.32858
2055	5.25587
2060	5.22709
2065	5.16397
2070	5.06367
2075	4.9685
2080	4.89294
2085	4.8494
2090	4.82939
2095	4.80617
2100	4.77039