need help with spreadsheet and 3 questions

Sheet1

Year	Total Sea Ice Area (m/km2)
1979	6.15
1980	6.03
1981	5.56
1982	6.11
1983	6.07
1984	5.78
1985	5.69
1986	6.11
1987	5.65
1988	5.65
1989	5.79
1990	5.22
1991	5.45
1992	5.66
1993	4.96
1994	5.4
1995	4.92
1996	5.96
1997	5.33
1998	4.92
1999	4.97
2000	5.02
2001	5.18
2002	4.54
2003	4.75
2004	4.88
2005	4.45
2006	4.55
2007	3.41
2008	4
2009	4.4
2010	4.12
2011	3.6
2012	3.12
2013	4.41
2014	4.33
2015	3.52

&"-,Bold"&18August Polar Sea Ice Area Loss Spreadsheet

This table provides information on polar sea ice area loss in August from 1979 to 2015 (National Oceanic and Atmospheric Administration (NOAA), 2015).