I have this table `Sales` in sqlite3 database.

```
Name    Sales       Date
"Vent"  "75.998"    "2014-12-31"
"Vent"  "153.988"   "2015-12-31"
"Vent"  "180.678"   "2016-12-31"
"Vent"  "372.819"   "2017-12-31"
"DBG"   "4046.0"    "2014-12-31"
"DBG"   "4454.0"    "2015-12-31"
"DBG"   "4238.0"    "2016-12-31"
"DBG"   "4371.0"    "2017-12-31"

```

I would like to add extra columns to this table to show sales growth. The new table will look something like this;

```
Name    Sales       Date          Year1_Growth      Year2_Growth        Year3_Growth
"Vent"  "75.998"    "2014-12-31"  null              null                null 
"Vent"  "153.988"   "2015-12-31"  153.988/75.998    null                null
"Vent"  "180.678"   "2016-12-31"  180.678/153.988   180.678/75.998      null
"Vent"  "372.819"   "2017-12-31"  372.819/180.678   372.819/153.988     372.819/75.998
"DBG"   "4046.0"    "2014-12-31"  null              null                null 
"DBG"   "4454.0"    "2015-12-31"  4454/4046         null                null 
"DBG"   "4238.0"    "2016-12-31"  4238/4454         4238/4046           null 
"DBG"   "4371.0"    "2017-12-31"  4371/4238         4371/4454           4371/4046          

```

Any hints on how to get started on the sql code?