Year	Percent
1950	8.68737
1955	8.93864
1960	10.44168
1965	10.35897
1970	9.92205
1975	10.34449
1980	9.55486
1985	10.39523
1990	10.39892
1995	9.86166
2000	7.96246
2005	6.54839
2010	6.20614
2015	6.88612
2020	7.52095
2025	7.24273
2030	6.46116
2035	5.75347
2040	5.50052
2045	5.66519
2050	5.94027
2055	6.02684
2060	5.85455
2065	5.57302
2070	5.38543
2075	5.36986
2080	5.44277
2085	5.49173
2090	5.43673
2095	5.30085
2100	5.17496