1987

7.1

1995

7.7

1994

7.5

2003

7.4

2017

6.5

1992

5.3

1981

6.6

2002

7.4

2012

7.0

1984

7.4

2015

0.0

2000

6.2

2006

7.2

1992

7.2

1990

7.1

1981

6.7

2002

8.2

2001

8.0

1999

7.0

6.3