Distribution and Numbers of Three Globally Threatened Waterbird Species Wintering in Morocco: The Common Pochard, Marbled Teal, and White-Headed Duck

Table 1

Number and percentage of wetlands visited per year.

Year	Number of surveyed wetlands	% of the IWC wetlands network (272)
Average	73	27
1983	47	17
1984	82	30
1985	49	18
1986	35	13
1987	69	25
1988	69	25
1989	56	21
1990	71	26
1991	94	35
1992	86	32
1993	94	35
1994	77	28
1995	89	33
1996	46	17
1997	70	26
1998	65	24
1999	65	24
2000	62	23
2001	65	24
2002	56	21
2003	62	23
2004	65	24
2005	59	22
2006	66	24
2007	77	28
2008	85	31
2009	79	29
2010	62	23
2011	100	37
2012	43	16
2013	78	29
2014	115	42
2015	70	26
2016	88	32
2017	76	28
2018	99	36
2019	131	48