2011

7.5

1998

5.5

2002

7.7

2011

8.1

2021

6.0

1971

7.5

2010

7.2

1989

5.9

2008

7.1

2001

6.9

2017

7.3

2004

7.4

2005

6.3

2002

6.0

1984

6.3

2017

6.9

2011

7.1

1999

6.8

1990

7.4

1993

7.4