Year	Percent
1950	7.20705
1955	6.48438
1960	5.99202
1965	7.4723
1970	7.45711
1975	7.91117
1980	8.15486
1985	7.34387
1990	6.63642
1995	5.98956
2000	5.92506
2005	5.94411
2010	5.98727
2015	5.58643
2020	5.51448
2025	5.7606
2030	5.73096
2035	5.71251
2040	5.55767
2045	5.40785
2050	5.32693
2055	5.37095
2060	5.45207
2065	5.48565
2070	5.45795
2075	5.38192
2080	5.31241
2085	5.27934
2090	5.27837
2095	5.27001
2100	5.24033