1995

7.2

2010

7.8

1988

6.4

2012

6.5

2003

6.7

2010

8.2

2017

6.1

2004

6.6

1990

7.7

2016

6.6

2000

7.1

2008

6.1

1968

8.1

2008

8.1

2008

7.6

2006

6.2

2003

6.9

1999

5.9

1991

6.2

2022

6.6