Year	Percent
1950	6.583
1955	7.46438
1960	8.06238
1965	7.6464
1970	7.41182
1975	7.89702
1980	7.77502
1985	6.48041
1990	5.58059
1995	5.73354
2000	5.8751
2005	5.91191
2010	5.30804
2015	4.77978
2020	4.73215
2025	4.89044
2030	5.05139
2035	4.94787
2040	4.77241
2045	4.6094
2050	4.55298
2055	4.6211
2060	4.7493
2065	4.82533
2070	4.81167
2075	4.73797
2080	4.67637
2085	4.65763
2090	4.66925
2095	4.68195
2100	4.66318