Year	Percent
1950	6.17584
1955	5.98542
1960	7.02271
1965	8.23517
1970	7.55658
1975	7.4771
1980	7.41778
1985	7.76027
1990	7.18449
1995	5.96292
2000	5.70917
2005	6.14006
2010	6.45763
2015	6.13224
2020	5.84631
2025	5.82212
2030	5.48873
2035	5.56931
2040	5.5959
2045	5.54987
2050	5.46754
2055	5.38309
2060	5.33055
2065	5.32039
2070	5.32355
2075	5.29923
2080	5.24532
2085	5.1832
2090	5.13214
2095	5.09866
2100	5.06876