Year	Ammonium 1992-2020 (679)	Ammonium 2000-2020 (1,047)
1992	497.49
1993	516.67
1994	440.19
1995	439.16
1996	500.39
1997	407.09
1998	332.56
1999	288.56
2000	263.79	366.71
2001	258.01	359.69
2002	272.67	377.18
2003	260.57	359.63
2004	220.77	304.63
2005	244.8	301.37
2006	223.93	281.63
2007	214.08	284.46
2008	163.87	247.37
2009	151.23	227.2
2010	134.69	194.76
2011	130.98	192.16
2012	122.9	202.42
2013	104.37	163.03
2014	95.37	140.14
2015	88.65	139.37
2016	88.71	139.83
2017	111.69	143.69
2018	107.03	134.73
2019	105.97	137.39
2020	114.61	153.53