Text loop for X-axis in time series. Example 2002-2018 by quarters, R

Text loop for X-axis in time series. Example 2002-2018 by quarters

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Absolute running time: 0.73 sec, cpu time: 0.96 sec, memory peak: 37 Mb, absolute service time: 1,06 sec

Years by quarters 1 2002T1 2 2002T2 3 2002T3 4 2002T4 5 2003T1 6 2003T2 7 2003T3 8 2003T4 9 2004T1 10 2004T2 11 2004T3 12 2004T4 13 2005T1 14 2005T2 15 2005T3 16 2005T4 17 2006T1 18 2006T2 19 2006T3 20 2006T4 21 2007T1 22 2007T2 23 2007T3 24 2007T4 25 2008T1 26 2008T2 27 2008T3 28 2008T4 29 2009T1 30 2009T2 31 2009T3 32 2009T4 33 2010T1 34 2010T2 35 2010T3 36 2010T4 37 2011T1 38 2011T2 39 2011T3 40 2011T4 41 2012T1 42 2012T2 43 2012T3 44 2012T4 45 2013T1 46 2013T2 47 2013T3 48 2013T4 49 2014T1 50 2014T2 51 2014T3 52 2014T4 53 2015T1 54 2015T2 55 2015T3 56 2015T4 57 2016T1 58 2016T2 59 2016T3 60 2016T4 61 2017T1 62 2017T2 63 2017T3 64 2017T4 65 2018T1 66 2018T2 67 2018T3 68 2018T4