1993

6.9

1993

6.2

2016

5.7

2015

6.5

1996

6.1

2008

6.8

1998

7.2

1994

6.7

1986

6.7

1989

7.2

1979

7.5

2004

5.8

1981

7.0

2005

7.4

1990

7.3

2014

3.0

2019

10.0

2010

7.5

1973

5.9

2018

6.0