Year	Percent
1950	8.47116
1955	9.72273
1960	10.02125
1965	10.10159
1970	9.28539
1975	7.83639
1980	6.96709
1985	6.65297
1990	6.84445
1995	7.07082
2000	7.11841
2005	6.46587
2010	6.45441
2015	6.32022
2020	5.83172
2025	5.89569
2030	5.94101
2035	5.87396
2040	5.75906
2045	5.65286
2050	5.58175
2055	5.56556
2060	5.58778
2065	5.5763
2070	5.51327
2075	5.4334
2080	5.36765
2085	5.33795
2090	5.32319
2095	5.30489
2100	5.26799