1992

6.5

2005

6.1

1989

7.9

1986

5.8

2009

6.7

2014

5.0

1980

7.1

1988

5.2

2012

7.1

1982

5.2

2013

6.0

2007

5.9

1994

6.9

2011

5.5

1978

7.0

2001

6.4

1989

5.5

2021

6.1

1989

5.9

2003

5.7