Year	Percent
1950	6.58647
1955	13.47567
1960	13.82142
1965	13.79547
1970	13.27447
1975	9.56177
1980	8.16778
1985	7.91448
1990	7.23381
1995	6.4014
2000	6.36784
2005	5.23835
2010	3.99625
2015	4.26397
2020	4.5754
2025	5.41078
2030	5.59819
2035	5.46913
2040	4.79604
2045	4.42805
2050	4.53846
2055	4.92542
2060	5.29252
2065	5.43854
2070	5.29772
2075	5.01699
2080	4.84427
2085	4.87496
2090	5.01941
2095	5.12411
2100	5.10459