Year	Percent
1950	10.1623
1955	10.52468
1960	10.78393
1965	10.64419
1970	10.39718
1975	10.24433
1980	9.19992
1985	8.30074
1990	7.64592
1995	7.88897
2000	9.85438
2005	10.50219
2010	7.58352
2015	4.44921
2020	2.99617
2025	4.56702
2030	5.42134
2035	5.26879
2040	4.82402
2045	4.27487
2050	3.92964
2055	3.88517
2060	4.00776
2065	4.08125
2070	4.0118
2075	3.86274
2080	3.76289
2085	3.79623
2090	3.93692
2095	4.09134
2100	4.17123