Year	Percent
1950	7.34756
1955	6.37681
1960	7.2055
1965	7.57618
1970	8.17648
1975	7.8172
1980	5.61707
1985	5.04892
1990	5.38463
1995	5.70059
2000	5.11683
2005	4.8643
2010	4.47113
2015	4.29308
2020	4.3591
2025	4.52567
2030	4.60849
2035	4.50999
2040	4.34464
2045	4.24744
2050	4.27206
2055	4.40649
2060	4.54904
2065	4.61001
2070	4.57776
2075	4.5143
2080	4.48148
2085	4.51207
2090	4.56082
2095	4.59234
2100	4.57599