1987

7.1

2011

6.9

2014

6.1

1997

6.0

2008

6.1

2000

6.6

2016

7.0

1996

7.4

1991

7.0

1990

6.6

1998

7.5

2023

7.4

1993

7.1

1982

5.2

1986

6.8

2010

4.4

2002

6.5

1980

7.0

2016

6.1

2016

7.3