1996

6.8

1985

8.3

2015

7.9

2009

7.6

2013

8.1

1989

7.9

1994

8.7

1997

7.9

2016

7.6

2010

8.4

1972

8.7

1990

7.4

2006

7.5

2013

6.5

2007

7.1

2018

7.4

1979

8.2

2023

8.4

2011

7.3

2023

8.1