You are considering purchasing one of several office buildings. At this stage in your research, you only have been given the break$-$even ratio over a four year period as the basis for making this potential purchase. Which would you consider to be the best choice based on this metric? The series contains the year and break$-$even ratio in the following format: $($ year $1,$ break$-$even ratio$)$ ; $($year $2,$ break$-$even ratio$)$ ; $($year $3,$ break$-$even ratio$)$ ; $($ year $4,$ break$-$even ratio$)$

$(2015,1\mathrm{.}11)$;$(2016,1\mathrm{.}12)$;$(2017,1\mathrm{.}14)$;$(2018,1\mathrm{.}22)$

$(2015,\mathrm{.}91)$;$(2016,\mathrm{.}89)$;$(2017,\mathrm{.}88)$;$(2018,\mathrm{.}86)$

$(2015,\mathrm{.}88)$;$(2016,\mathrm{.}91)$;$(2017,\mathrm{.}87)$;$(2018,\mathrm{.}92)$

$(2015,\mathrm{.}89)$;$(2016,\mathrm{.}88)$;$(2017,\mathrm{.}89)$;$(2018,\mathrm{.}89)$

$(2015,1\mathrm{.}21)$;$(2016,1\mathrm{.}12)$;$(2017,1\mathrm{.}04)$;$(2018,1\mathrm{.}01)$