Year	metric tons
1961	3583000
1962	3725100
1963	4053500
1964	4212100
1965	3707000
1966	4073300
1967	3787800
1968	3662000
1969	4378400
1970	4364500
1971	4499200
1972	4309500
1973	4816500
1974	5068000
1975	5246700
1976	5490600
1977	5798900
1978	5798200
1979	6006100
1980	5752400
1981	6254900
1982	5329000
1983	5481000
1984	5825000
1985	5841000
1986	6232000
1987	6240000
1988	6252000
1989	6466000
1990	6280305
1991	8823709.59
1992	8681000
1993	9137000
1994	7215000
1995	3805000
1996	2614000
1997	2886000
1998	4440000
1999	3852000
2000	2942000
2001	3879704
2002	4211000
2003	4393000
2004	4485000
2005	4645400
2006	4675500
2007	3892500
2008	4680528.17
2009	4437509.74
2010	4514870.92
2011	4694507.75
2012	5195203.79
2013	5199405.86
2014	5223725.87
2015	4481457.55
2016	4975484.59
2017	4844532.35
2018	4238820.43
2019	5703242.89
2020	4665733.01
2021	4729035.33
2022	4662162.3