1989

7.4

1995

8.4

2009

7.6

1972

8.7

2014

6.5

1996

8.0

1979

8.2

2016

7.9

1998

7.8

2019

8.5

2019

8.0

2019

8.1

2015

7.8

2014

8.4

2019

7.7

2010

8.2

1994

8.5

2006

8.2

2000

8.2

1992

8.1