2001

6.2

1998

6.3

2005

7.1

1968

7.2

1989

7.8

2001

6.1

2006

8.2

1993

6.5

2007

6.9

2008

4.3

2004

6.4

2016

4.9

1972

8.7

1974

8.6

1990

7.4

2008

8.5

2017

5.6

2008

6.7

1996

7.0

1988

6.1