Year	Percent
1950	6.44553
1955	7.51579
1960	8.85969
1965	8.11561
1970	7.95328
1975	7.80263
1980	8.14601
1985	7.55129
1990	6.25896
1995	5.97885
2000	6.41532
2005	6.76775
2010	6.45777
2015	5.89803
2020	5.89475
2025	5.5273
2030	5.6069
2035	5.60813
2040	5.54163
2045	5.44622
2050	5.35726
2055	5.30218
2060	5.29256
2065	5.29891
2070	5.27845
2075	5.22491
2080	5.16178
2085	5.11208
2090	5.08265
2095	5.05667
2100	5.03145