1998

7.2

2007

6.7

2003

7.0

2019

5.8

2004

5.6

2005

7.0

2004

7.1

1977

7.7

1984

7.2

1999

7.6

1981

7.0

2002

6.4

2000

6.5

2023

6.7

2000

6.5

2021

7.4

2002

5.2

2004

5.4

1975

5.9

2006

5.4