Year	Percent
1950	8.32061
1955	8.80303
1960	10.62042
1965	9.25702
1970	9.04593
1975	9.27243
1980	8.88129
1985	7.53174
1990	6.23737
1995	6.03525
2000	6.30219
2005	6.34579
2010	6.12687
2015	6.16944
2020	5.62709
2025	5.29347
2030	5.31808
2035	5.37423
2040	5.3666
2045	5.29521
2050	5.17839
2055	5.08164
2060	5.07695
2065	5.13896
2070	5.16719
2075	5.13683
2080	5.06319
2085	4.99408
2090	4.9649
2095	4.97454
2100	4.98407