1990

6.9

2009

7.7

1993

5.6

1988

6.5

1999

7.9

1997

6.3

1998

7.9

2015

6.1

1980

8.6

1984

7.0

2015

7.1

2012

7.3

2013

6.6

2009

6.3

1984

7.3

2012

6.1

2008

7.6

2003

5.5

2022

7.8

2009

7.7