How would you describe interest rate developments since the mid1990s?

Table 1 Primary Treasury bill rates (in percent) 2002 2003 2004 2005 2006 2007 2008 2009 5.433 7.340 6.358 3.406 5.389 91-day 182-day 364-day 1998 1999 2000 2001 15.266 10.197 9.861 9.860 16.291 | 11.136 10.842 11.184 17.397 11.704 11.800 | 11.981 6.028 6.953 7.489 5.351 6.149 4.186 4.395 7.827 8.321 7.671 6.193 4.184 4.917 6.822 9.218 8.683 6.955 6.492 4.591 2010 2011 2012 2013 2014 2015 2016 2017 2018 3.728 1.371 1.583 1.244 1.500 2.147 3.539 91-day 182-day 364-day 3.965 2019 Q1 2020 4.674 3.161 5.065 3.450 5.232 3.789 0.315 0.484 0.720 1.605 1.772 1.924 2.077 1.583 1.692 2.264 2.502 1.759 1.965 4.489 4.257 1.788 1.761 2.879 5.144