1997

7.4

1996

6.4

2001

6.6

2004

7.5

2020

6.5

1995

7.2

1986

8.0

2002

7.5

2006

7.1

2002

8.1

2015

6.5

2015

7.0

2005

7.8

1996

8.5

1994

8.2

2005

7.3

2008

4.6

2016

8.3

2007

8.6

2018

7.5