Year	Percent
1950	6.32219
1955	13.11556
1960	13.68148
1965	13.75823
1970	13.18547
1975	9.3592
1980	8.2462
1985	7.8454
1990	7.05841
1995	6.20242
2000	6.03634
2005	4.87662
2010	3.61362
2015	3.8009
2020	4.03292
2025	4.75425
2030	4.92397
2035	4.81227
2040	4.21277
2045	3.88586
2050	3.98978
2055	4.35226
2060	4.7163
2065	4.89919
2070	4.82838
2075	4.62741
2080	4.52101
2085	4.59963
2090	4.77852
2095	4.9107
2100	4.91117