Year	Percent
1950	8.88063
1955	9.36874
1960	9.02362
1965	8.95277
1970	9.23928
1975	8.43598
1980	8.28707
1985	7.58489
1990	6.37654
1995	5.28846
2000	4.89457
2005	4.76677
2010	4.68254
2015	4.40073
2020	3.98649
2025	3.56703
2030	3.39675
2035	3.47981
2040	3.60826
2045	3.68419
2050	3.67129
2055	3.60971
2060	3.57798
2065	3.65928
2070	3.82318
2075	3.9929
2080	4.08652
2085	4.10213
2090	4.08408
2095	4.09431
2100	4.15489