Year	Percent
1950	10.24488
1955	9.47002
1960	9.74352
1965	9.66976
1970	10.8339
1975	10.76742
1980	10.79297
1985	11.22786
1990	12.22636
1995	11.28618
2000	10.32662
2005	9.90678
2010	9.68492
2015	9.34326
2020	8.65912
2025	8.01417
2030	7.74381
2035	7.29062
2040	6.82112
2045	6.3722
2050	6.0031
2055	5.71473
2060	5.50363
2065	5.32942
2070	5.18406
2075	5.04292
2080	4.9422
2085	4.86673
2090	4.82342
2095	4.79754
2100	4.77383