National-level changes in herbicide ai use and field EIQ values for GM HT soybeans in Canada 1997–2020.

Year	ai saving (kg)	EIQ saving (units)	% decrease in ai (- = increase)	% EIQ saving
1997	530	20,408	0.03	0.06
1998	25,973	1,000,070	1.8	3.0
1999	106,424	4,097,826	7.4	11.9
2000	112,434	4,329,247	7.4	11.9
2001	169,955	6,544,073	11.1	17.9
2002	230,611	8,879,609	15.7	25.4
2003	276,740	10,655,776	18.5	29.8
2004	351,170	13,521,703	20.4	32.8
2005	373,968	14,399,532	22.2	35.8
2006	84,130	10,190,844	4.8	24.5
2007	75,860	9,167,256	4.5	22.7
2008	96,800	11,725,560	5.6	28.5
2009	103,374	12,521,832	5.2	26.5
2010	113,729	13,776,201	5.4	27.3
2011	97,749	11,840,550	4.4	22.2
2012	119,977	14,533,032	5.0	25.3
2013	133,634	16,187,269	5.0	25.3
2014	149,969	18,165,957	3.7	24.1
2015	65,157	12,734,412	1.7	16.7
2016	67,142	13,122,473	1.7	17.1
2017	84,235	16,463,031	1.6	16.1
2018	73,787	14,421,142	1.7	16.3
2019	69,947	13,670,602	1.8	17.3
2020	61,434	12,006,856	1.7	16.9

Sources: Own calculations based on data from George Morris Center 2004,³⁹ Weed Control Guide Ontario (updated annually), extension and industry advisors