Year	Percent
1950	8.9536
1955	8.59697
1960	8.67469
1965	8.55783
1970	8.92853
1975	9.11948
1980	8.25406
1985	8.7588
1990	8.93479
1995	7.98253
2000	8.00781
2005	8.15248
2010	7.71974
2015	7.27082
2020	6.96385
2025	6.70933
2030	6.51365
2035	6.32845
2040	6.12121
2045	5.88937
2050	5.67982
2055	5.52107
2060	5.40137
2065	5.2963
2070	5.20034
2075	5.11207
2080	5.03419
2085	4.97105
2090	4.93383
2095	4.90265
2100	4.86579