Year	Percent
1950	9.07073
1955	9.07865
1960	9.46697
1965	9.64176
1970	9.47439
1975	9.14454
1980	8.89307
1985	9.40035
1990	10.46393
1995	9.68125
2000	9.49444
2005	9.24924
2010	8.67255
2015	8.57232
2020	8.30306
2025	8.11478
2030	7.78248
2035	7.44925
2040	7.15606
2045	6.88807
2050	6.64519
2055	6.42278
2060	6.21895
2065	6.02238
2070	5.84933
2075	5.71146
2080	5.59184
2085	5.495
2090	5.40446
2095	5.3176
2100	5.24515