Year	Percent
1950	8.78431
1955	8.24349
1960	9.2604
1965	9.09531
1970	7.93367
1975	7.88484
1980	7.46651
1985	7.36232
1990	7.57551
1995	7.04474
2000	6.19135
2005	5.05846
2010	4.53464
2015	4.40296
2020	5.04084
2025	5.25866
2030	5.05621
2035	4.71597
2040	4.42257
2045	4.38246
2050	4.62111
2055	4.92337
2060	5.05114
2065	4.97374
2070	4.83222
2075	4.78103
2080	4.86653
2085	5.00531
2090	5.08321
2095	5.03383
2100	4.91093