Year	Total
1980	4983101200
1981	4977781600
1982	4784775600
1983	4860750400
1984	4922539600
1985	4959504000
1986	4781365600
1987	4828969200
1988	4782593200
1989	4674428000
1990	4615776000
1991	4384714400
1992	4255134400
1993	4116415600
1994	4041122800
1995	4057900000
1996	4070176000
1997	4162791600
1998	3895311200
1999	4047124400
2000	4145196000
2001	4151879600
2002	4183524400
2003	4003340000
2004	3996383600
2005	4081360800
2006	4016161600
2007	4154744000
2008	3873214400
2009	4210940800
2010	4772636000
2011	5425310000
2012	6026152000
2013	6610353200
2014	7496816800
2015	6545426800
2016	6545426800