Population trends.

1-10 (1975-77); 11-18 (1978-79); 19-26 (1980-81); no.3-30 yr.1976-82; no.22-30 (winter 1980-1982); 27-34 (1982-83); no.31-38 (1983-84); no.31-42 yr.1983-85; 35-42 (1984-85); no.35-46 1984-1986; no.39-46 (1985-86); 43-50 (1986-87); no.47-54 (1987-88); no.51-54 yr.1988; 51-58 (1988-89); no.55-62 (1989-90); 59-66 (1990-91); no.63-66 (1991); no.63-65 yr.1991; no.63-69 1991-1992; no.67 (spring 1992); no.68 (summer 1992); no.69-70 (fall-winter 1992); 67-74 (1992-93); no.71-74 (1993); no.67-76 yr.1992-94; 75-78 (1994); no.75-78 (1994); no.79-86 yr.1995-96; 83-86 (1996); 87-90 (1997); no.91-94 (1998); no.95-98 (1999); no.99-102 (2000); no.103-106 (2001); no.107-110 (2002); no.111-114 (2003); no.115-118 (2004); no.119-122 (2005); no.123-126 (2006); no.127-130 (2007); no.131-134 (2008); no.135-138 (2009); no.139-141 (spring-fall 2010); no.139-142 yr.2010; no.144-146 (summer-winter 2011); 79-82(1995); 103-105(2001); 91-94(1998); index: yr.1975-95 mi.index; index no.1-114; index no.1-94; index 1975/95 (1995); index 1975/98 (1998)