Year	Percent
1950	8.90507
1955	8.78937
1960	8.15332
1965	7.49424
1970	8.8228
1975	9.57047
1980	11.31667
1985	11.11658
1990	11.09137
1995	10.76819
2000	11.00741
2005	12.49789
2010	9.96601
2015	7.53422
2020	6.60058
2025	7.88046
2030	9.64092
2035	8.70349
2040	7.6755
2045	6.90222
2050	6.54458
2055	6.58766
2060	6.81028
2065	6.93167
2070	6.69135
2075	6.24356
2080	5.91482
2085	5.80535
2090	5.84393
2095	5.89815
2100	5.85036