1992

6.8

2011

7.5

1989

8.5

2018

8.0

2015

8.2

2013

7.4

2014

6.6

1980

8.6

2020

7.1

2015

7.5

2018

7.2

2015

6.7

1995

8.1

2015

7.3

1986

8.3

2004

7.6

2003

7.3

1999

8.2

1990

8.0

2013

8.0