Year	Percent
1950	9.88776
1955	10.01629
1960	8.5503
1965	7.80065
1970	8.0641
1975	8.49413
1980	8.33344
1985	7.34564
1990	7.61477
1995	7.17985
2000	8.31431
2005	9.01279
2010	6.93637
2015	4.91598
2020	5.21703
2025	6.29098
2030	6.24111
2035	6.04074
2040	5.74528
2045	5.28946
2050	5.12155
2055	5.44242
2060	5.8216
2065	5.89666
2070	5.71575
2075	5.46329
2080	5.30506
2085	5.33826
2090	5.47933
2095	5.57521
2100	5.53227