Year	Percent
1950	8.28306
1955	9.57711
1960	8.70353
1965	8.49703
1970	8.29528
1975	8.54768
1980	7.88248
1985	6.57264
1990	6.2888
1995	6.76258
2000	7.11975
2005	6.847
2010	6.21804
2015	6.23733
2020	5.82077
2025	5.89234
2030	5.8543
2035	5.74894
2040	5.62397
2045	5.51546
2050	5.44157
2055	5.41649
2060	5.41125
2065	5.3818
2070	5.31954
2075	5.24601
2080	5.18629
2085	5.14953
2090	5.11874
2095	5.08875
2100	5.04165