I am practicing how to make a thesis and want to learn things based on ways if a tutor explains well.

So, independent variable is GDP in each country (https://data.oecd.org/gdp/gross-domestic-product-gdp.htm)

Location 2009 - 2010 - 2011 - 2012 - 2013 2014 2015 2016 2017 2018 2019 2020 Argentina 16 477 18 062 19 322 19 641 20 132 19 684 20 105 20 308 23 597 23 306 22 997 Australia 41 614 42 787 44 419 43 879 47 761 47 645 47 317 50 238 50 854 53 083 53 079 51 743e Austria 40 957 42 053 44 469 46 478 47 937 48 814 49 942 52 665 54 185 57 069 58 665 55 340 Belgium 37 779 39 869 40 943 42 290 43 673 44 930 46 202 48 599 50 443 52 663 54 709 52 063p Brazil 13 331 14 360 15 110 15 120 15 669 15 800 14 816 14 326 14 597 15 091 Bulgaria 13 928 14 605 15 667 16 247 16 589 17 561 18 343 20 020 21 387 22 911 24 579 24 350p Canada 38 894 40 114 41 667 42 291 44 299 45 754 44 670 46 472 48 317 50 240 50 661 48 091 Chile 16 120 18 129 20 303 21 447 22 353 22 688 22 604 23 350 24 402 24 686 25 857 24 648e China (People's 8 288 Republic of) 9 232 10 275 11 170 11 894 12 517 12 947 13 533 14 306 t Colombia 10 399 10 866 11 727 12 115 12 800 13 366 13 331 14 055 14 480 15 256 16 077 14 994e Costa Rica 12 702 13 318 14 068 14 853 15 542 16 616 17 649 19 119 20 368 20 988e 21 759e 20 972e Croatia 20 004 19 810 20 793 21 161 21 827 22 073 22 981 24 888 26 766 28 533 30 231p 28 594e Cyprus 33 910 33 449 33 313 31 835 30 375 30 080 31 815 35 719 38 051 40 477 41 515p 38 603p Perspectives Countries Time Total Highlighted Countries (0) yearly quarterly monthly US dollars