Year	Percent
1950	6.00799
1955	6.54767
1960	7.19179
1965	6.36538
1970	6.00139
1975	7.07929
1980	7.88827
1985	7.63767
1990	6.2426
1995	5.44569
2000	5.65885
2005	5.65568
2010	5.7086
2015	5.01678
2020	4.62523
2025	4.44052
2030	4.50342
2035	4.73308
2040	4.77289
2045	4.64472
2050	4.4647
2055	4.38772
2060	4.4602
2065	4.61228
2070	4.73971
2075	4.76342
2080	4.70972
2085	4.6454
2090	4.63276
2095	4.66389
2100	4.70452