Year	annual %
1964	35.4210649777883
1965	-2.72698027762915
1966	15.7801012491141
1967	36.9265248728318
1968	53.3216727107739
1969	6.17619573522314
1970	8.02528404548487
1971	5.77734982596516
1972	15.8042153907951
1973	15.6427621238194
1974	29.4692810459945
1975	28.6579701952268
1976	80.385959075414
1977	68.9477081989997
1978	48.7690376115202
1979	101.051260411497
1980	46.6259068303308
1981	35.4082648744294
1982	36.6996975740914
1983	76.5266976662658
1984	52.2270113573208
1985	23.820784521335
1986	44.4
1987	78.6703601108033
1988	71.0917312661503
1989	104.06522942826
1990	81.295404814004
1991	2154.43682711341
1992	4129.16985661558
1993	1986.90476190476
1994	23773.1317741016
1995	541.908883239027
1996	492.441850235414
1997	198.516707416463
1998	29.1488069236652
1999	284.894975914087
2000	513.906843747535
2001	359.936614264586
2002	31.5225826025495
2003	12.8739657187405
2004	3.99438400815971
2005	21.3168167229341
2006	13.0526949745101
2007	16.945100654195
2008	17.3013845700157
2009	2.79999999999982
2010	7.10000000000037
2011	15.316515913949
2012	9.72182806273364
2013	0.808223101487111
2014	1.24303889760803
2015	0.74419899478147
2016	2.88585107289988