Year	Percent
1950	6.75667
1955	5.91545
1960	6.84864
1965	7.28414
1970	7.35302
1975	6.78185
1980	5.68045
1985	5.30231
1990	5.46723
1995	5.87751
2000	6.25206
2005	6.09323
2010	5.64726
2015	5.21962
2020	5.30457
2025	5.5679
2030	5.51449
2035	5.41507
2040	5.3315
2045	5.24793
2050	5.21532
2055	5.25655
2060	5.30904
2065	5.30657
2070	5.26253
2075	5.20016
2080	5.14289
2085	5.10123
2090	5.07465
2095	5.03938
2100	4.98864