1997

5.6

1998

4.6

2001

6.8

2001

4.0

2005

8.3

1993

4.0

2012

6.7

1997

5.5

2016

6.8

2010

2.8

2002

7.9

1984

7.5

2011

7.3

1999

10.0

2011

8.2

2018

8.5

2000

4.6

2018

8.5

2007

5.9