2012

7.6

2014

7.8

1999

5.0

2002

7.9

2015

6.5

1990

7.4

1999

7.9

1988

6.0

1989

6.1

1987

7.7

1996

7.0

1989

8.0

2009

7.6

1997

6.3

1984

7.5