2001

7.2

1998

7.2

2010

8.5

2019

9.4

1988

7.1

1971

8.1

2012

6.2

2007

9.6

2010

6.8

2000

7.6

2004

8.3

1998

6.9

1996

7.1

2017

6.4

1991

7.6

2011

6.7

2014

8.2

1997

8.1

1999

7.9

2001

6.6