Year	Percent
1950	12.15505
1955	13.79386
1960	14.55873
1965	15.44141
1970	15.44023
1975	13.75954
1980	11.97189
1985	12.98377
1990	13.30442
1995	14.02547
2000	13.33436
2005	13.5348
2010	10.6184
2015	12.21009
2020	11.8753
2025	11.44477
2030	10.84302
2035	10.13569
2040	9.58787
2045	9.46846
2050	9.52803
2055	9.33868
2060	8.92575
2065	8.44205
2070	8.05121
2075	7.84347
2080	7.74798
2085	7.61577
2090	7.34846
2095	7.00271
2100	6.70149