Updating exercices

module3/exo3/Wheat.csv

+rownames,Year,Wheat,Wages
+1,1565,41,5
+2,1570,45,5.05
+3,1575,42,5.08
+4,1580,49,5.12
+5,1585,41.5,5.15
+6,1590,47,5.25
+7,1595,64,5.54
+8,1600,27,5.61
+9,1605,33,5.69
+10,1610,32,5.78
+11,1615,33,5.94
+12,1620,35,6.01
+13,1625,33,6.12
+14,1630,45,6.22
+15,1635,33,6.3
+16,1640,39,6.37
+17,1645,53,6.45
+18,1650,42,6.5
+19,1655,40.5,6.6
+20,1660,46.5,6.75
+21,1665,32,6.8
+22,1670,37,6.9
+23,1675,43,7
+24,1680,35,7.3
+25,1685,27,7.6
+26,1690,40,8
+27,1695,50,8.5
+28,1700,30,9
+29,1705,32,10
+30,1710,44,11
+31,1715,33,11.75
+32,1720,29,12.5
+33,1725,39,13
+34,1730,26,13.3
+35,1735,32,13.6
+36,1740,27,14
+37,1745,27.5,14.5
+38,1750,31,15
+39,1755,35.5,15.7
+40,1760,31,16.5
+41,1765,43,17.6
+42,1770,47,18.5
+43,1775,44,19.5
+44,1780,46,21
+45,1785,42,23
+46,1790,47.5,25.5
+47,1795,76,27.5
+48,1800,79,28.5
+49,1805,81,29.5
+50,1810,99,30
+51,1815,78,
+52,1820,54,
+53,1821,54,