Year	Percent
1960	19.82307
1961	38.05242
1962	16.20957
1963	34.3781
1964	41.55298
1965	47.58529
1966	43.16604
1967	47.4
1968	32.895
1969	29.90854
1970	28.89418
1971	44.44
1972	52.83191
1973	43.98948
1974	25.89353
1975	28.98173
1976	20.12102
1977	22.56
1978	16.27427
2020	183.38193
2021	251.06368