Table 2 Distribution of any^a and frequent^b cannabis use across years among boys and girls in the 8th or 9th grades of comprehensive school in Finland (%)

2000–2001 (n = 42685)

2002–2003 (n = 51309)

2004–2005 (n = 53499)

2006–2007 (n = 54841)

2008–2009 (n = 54433)

2010–2011 (n = 51329)

2012–2013 (n = 50223)

2014–2015 (n = 25147)

Any cannabis use

9.1

9.1

7.1

6.1

6.5

8.6

9.8

10.1

Frequent cannabis use

2.9

3.0

2.4

2.1

2.2

3.2

3.7

5.0

2000–2001 (n = 42122)

2002–2003 (n = 49481)

2004–2005 (n = 51979)

2006–2007 (n = 54286)

2008–2009 (n = 54216)

2010–2011 (n = 51216)

2012–2013 (n = 49255)

2014–2015 (n = 25257)

Any cannabis use

8.0

7.7

6.0

4.6

4.4

5.8

6.4

6.2

Frequent cannabis use

1.8

1.7

1.3

1.0

1.0

1.3

1.7

2.2