Year	Percent
1950	6.75734
1955	6.57272
1960	6.15712
1965	6.76176
1970	7.19658
1975	7.31523
1980	6.82298
1985	5.5112
1990	5.2749
1995	5.38367
2000	5.70579
2005	6.0458
2010	5.87731
2015	5.39072
2020	5.21167
2025	5.28553
2030	5.51688
2035	5.46946
2040	5.38467
2045	5.31501
2050	5.2436
2055	5.21672
2060	5.25994
2065	5.31026
2070	5.30483
2075	5.26148
2080	5.20033
2085	5.14023
2090	5.09553
2095	5.06864
2100	5.03363