1995

5.1

2018

6.1

2002

6.9

2016

5.5

2020

5.0

1997

6.5

1996

3.3

2003

6.6

2005

4.2

2009

7.0

1998

7.1

1982

6.6

1983

7.1

1999

6.8

1998

6.8

1999

8.2

2009

7.5

2007

7.5

2003

6.8

2006

5.0