1987

6.8

2008

6.7

2016

4.7

1999

5.7

2002

4.4

2006

6.8

1997

5.3

2007

5.7

2003

6.6

1999

6.5

1982

6.7

1994

7.1

1991

6.4

1973

8.0

2002

5.4

2010

6.1

2007

5.5

2017

3.0

2023

6.1

2002

5.2